Fig. 8
Left: WSRT 1382 MHz image of Abel 697. Contour levels are drawn as in Fig. 1. Black dotted lines indicate the integration area for the flux measurements. Middle: WSRT 1714 MHz image of Abell 697. Contour levels are drawn as in Fig. 1. Right: A697 radio halo spectrum. Flux measurements at 325 and 610 MHz are taken from Macario et al. (2010).
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